How to output associative array in php

Associative array is a commonly used data type in PHP. It consists of a series of key/value (key/value) pairs. Associative arrays are different from ordinary arrays in that their subscripts are usually strings instead of numbers. This string can be any legal character, including Chinese characters, etc.

How to output an associative array in php? Below we will introduce some commonly used methods.

Method 1: Use foreach loop

The foreach loop is a method of traversing an array. It achieves the purpose of traversing the array by assigning each element of the array to a variable. When using a foreach loop in an associative array, you need to use two variables, "key" and "value", to loop through.

For example:

$arr = array("name"=>"张三", "age"=>18, "sex"=>"男");
foreach($arr as $key=>$val){
  echo $key . "=>" . $val . "<br/>";
}

In the above code, we use an associative array $arr, which contains three elements (name, age, sex), and then use a foreach loop to traverse For the entire array, each time it is looped, the $key variable stores the key of the associative array, the $val variable stores the value of the associative array, and finally they are output.

Method 2: Use the print_r() function

The print_r() function is a function in PHP specially used to output the contents of an array. It can output any type of array, including associative arrays.

For example:

$arr = array("name"=>"张三", "age"=>18, "sex"=>"男");
print_r($arr);

In the above code, we directly pass the associative array $arr as a parameter to the print_r() function. At this time, the function will automatically recognize the parameter as an array , and output the contents of the array.

Method 3: Use the var_dump() function

The var_dump() function is another function in PHP that is specifically used to output the contents of an array. It is similar to the print_r() function and can convert any An array of type is output.

For example:

$arr = array("name"=>"张三", "age"=>18, "sex"=>"男");
var_dump($arr);

In the above code, we also directly pass the associative array $arr as a parameter to the var_dump() function, which will output each element in the array and its type.

The above are three common methods for outputting associative arrays in PHP. You can choose different methods according to your needs.

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